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Temperature Discrimination by Captive Free‐Swimming Tuna, Euthynnus affinis
Author(s) -
Steffel Sherry,
Magnuson John J.,
Dizon Andrew E.,
Neill William H.
Publication year - 1976
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1976)105<588:tdbcft>2.0.co;2
Subject(s) - tuna , pelagic zone , fishery , biology , fish <actinopterygii> , zoology
Captive kawakawa, Euthynnus affinis, were instrumentally conditioned to respond to an increase in temperature to determine discrimination abilities. Two fish yielded a discrimination threshold of 0.10 to 0.15 C. Thermal sensitivity of this high‐seas pelagic fish is thus no more acute than that of inshore fishes and appears inadequate for direct sensing of weak horizontal temperature gradients at sea.